Monoazo dye and process of making.



UNITED" sTArns r rENT OFFICE.

- 9 ;l'.TO ERNST AND HEINRICH EICHWEDE, F HfiCHS'f-ON-THE-MAIN,GERMANY, AS

5 in presence of sodium earbonate or, preferit is advantagmus to previously preeipitate ,hemist, citizens of the Emgitre of (}er1nany,

SIGNORS TO FARBWERKE VORM. MEISTER LUcIUs & BRt'mING, OF H6cHs'r-0N-THE- MAIN, GERMANY", A CORPORATION OF GERMANY.

MONOAZO DYE AND PROCESS OF MAKING.

978,865. No Drawing.

Specification of Letters Patent.

Application filed April 4, 1910. Serial No. 553,425.

theJmta-oxynaphthoic acid from the solution of the sodium salt by means of a dilute mineral acid, in a fine aqueous suspension.

To (ill whom it may concern: Bent known that; we, O'rro Enxs'r, Ph. D., chemist, and HEINRICH Elcnwiznn, Ph. 1).,

residing at Hechst on-the-i a-in, Germany, have Invented certain-new and useful Im- I hle in benzene, dissolving in concentrated Brevements 1n Monoazo- Dyestuffs and \Ve have fo und thati'a monoazo dyestutf of valuableproperties for the manufacture ofigol er lakes is obtained by combining the.

onipound of thei2-4-dinitranilin-6- only soluble with dillienlt-y, it best to use cid withid naphthohii carbexylic for making printing-colors and oil-colors? acid -T lakes vproduced from thisdye Havingnow described our -in\ 'ent-ion what qua are artieiilarlyidistingiuished1by the we claim'is:-

filowing' properties:'-'Ihey give a-clear luislbred tint: they are easily precipitated, (over well, are insoluble in oiland very fast. 1 to light,"in which respect they are for in-" stance considerably superior to-the lakes of the dyestufi' obtained from |nu'a-'nitranilin- .ortho-sulfoni(.- aeid and beta-oxynaphthoie acid, described in U. SLia'tent No. 741.029. In view of the fact-that dinitranilin-sulfonic acids have hitherto not been used for preparing dye-lakes, it has not been possible to draw any txmel'usions as to the properties of the said dyestulfl The manufacture of this dyestulf may be carried out byeombiniirg the (liNZO'NHIL- pound of the 2.4-dinitrauilin-(i-sulfonir: acid with an equivalent quantity of beta-oxynaphthoic acid of melting point 216"(1,

combining 2.4-diuitrodiazolxnzol-(i-sulfonie acid with beta-onynaphthoie arid.ofmeltiirg point 2H3 2. .\s new product, the dyes-hilt obtained by combining 2.4-dinitrodiaztibeuzol-ti siilfonie acid with beta-oxynaphthoic acid of melting point 216 being a dark-red powder, dijli'cuiliy soluble in water and-alcohol. insoluble inf benzene, dissolving in coneentrated sulfuric acid with a bllliSll-l'ltl color, and separating, on addition of water, as a red precipitate.

tures in presence of two witnesses.

()TTO ERNS' HEINRICH ElClllYEDl].

- \Vitnesses:

JEAN Gnuxn, Cam. (iltliNI).

ably, sodium acetate as an arid combining agent; the coupling may also be etlta-tcd by means of a mineral aeid alone, in which case latented Dec. 20, 1910.

The product is a dark-red powder. dim-- cult-Iv soluble in water and alcohol, insolu- 45 sulfuric acid with a bluish-red color, ,and

rocesse's of Makin Same, of-which the separating, on addition of water, as a red following is a specitiiz atlon. prec1p1tate.-

Owing to the fact that the'dyestnfl' is v it in form ofa paste; the dyestufi is suitable for preparing wall-paper colors as well asin testimony whereof,-we aflix our signa 1 I he herein described process-of manu u faetu'rmgi "a' red monoazo .dyest utf suitable for preparing eolor-lakes. wlueh eonslsts m 

